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15
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Photosynthetic organisms release this gas when they produce food.
Oxygen (O2)
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25
×
The goal of cellular respiration is to...
make energy
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20
×
What atoms make up an ozone molecule?
3 oxygen atoms
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20
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Approximately what percentage of the air is carbon dioxide?
0.037%
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15
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Scientists believe the Earth formed... when? (give your answer in English)
4.5 or 4.6 billion years ago.
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lifesaver
Give 5 points!
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seesaw
Swap points!
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gift
Win 25 points!
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thief
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25
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What molecule captures light energy in plants and algae?
Chlorophyll
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25
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Respiration is a process that release _______________ for the cell to use.
energy
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15
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Organisms (plants, algae, some bacteria) get the energy they need for photosynthesis from sunlight. True or false?
True
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15
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This layer is where weather occurs
troposphere
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25
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What caused the amount of carbon dioxide to decrease and the amount of oxygen to increase in the early atmosphere?
Photosynthesis
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baam
Lose 25 points!
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rocket
Go to first place!
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gift
Win 20 points!
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thief
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25
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Where can we find nitrogen in living things?
In proteins and nucleic acids (such as DNA)
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15
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What is the fourth atmospheric layer from the ground?
Thermosphere
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15
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This gas makes up 21% of the dry air
Oxygen
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eraser
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magnet
Take 10 points!
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fairy
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25
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baam
Lose 25 points!
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